Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 66, Issue 2, Pages 262-272Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2006.02.050
Keywords
zinc; carboxylate; IR; stretching vibration; structure
Categories
Ask authors/readers for more resources
The correlation of the infrared spectra of zinc(II) carboxylates with their structures was investigated in the paper. The complexes with different modes of the carboxylate binding, from chelating, through bridging (syn-syn, syn-anti, monatomic), ionic to monodentate were used for the study, namely [Zn(C6H5CHCHCOO)(2)(H2O)(2)] (I) With chelating carboxylate group (C6H5CHCHCOO=cinnamate), [Zn-2(C6H5COO)(4)(pap)(2)] (II) with syn-syn bridging carboxylate (C6H5COO=benzoate; pap=papaverine), [Zn(C6H5CHCHCOO)(2)(mpcm)](n) (III) with syn-anti carboxylate bridge (mpcm = methyl-3-pyridylcarbamate), [Zn(C5H4NCOO)(2)(H2O)(4)] (IV) with ionic carboxylate group (C5H4NCOO = nicotinate), [Zn(C6H5COO)(2)(pcb)(2)](n) (V) with monodentate carboxylate coordination (pcb = 3-pyridylearbinol) and [Zn-3(C6H5COO)(6)(nia)(2)] (VI) with syn-syn and monatomic carboxylate bridges (nia = nicotinamide). First, the mode of the carboxylate binding was assigned from the infrared spectra using the magnitude of the separation between the carboxylate stretches, Delta(exp) = nu(as)(COO-) - nu(s)(COO-). Then the values Delta(exp) were compared with those calculated from structural data of the carboxylate anion (Delta(calc)). The conclusions about the carboxylate binding which resulted from the Delta values, were confronted with the crystal structure of the complexes. The limitations and recommendations were formulated to assign the mode of the carboxylate binding from the infrared spectra. The dependence of the Delta(exp) values on the magnitudes of Zn-O-C angles in bidentate carboxylate coordination was observed. (c) 2006 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available